cURL error 60: SSL certificate: unable to get local issuer certificate

Question

I use WAMP on a local development environment and am trying to charge a credit card but get the error message:

cURL error 60: SSL certificate problem:

Answer 1

This might be an edge case, but in my case the problem was not the client conf (I already had curl.cainfo configured in php.ini), but rather the remote server not being configured properly:

It did not send any intermediate certs in the chain. There was no error browsing the site using Chrome, but with PHP I got following error.

cURL error 60

After including the Intermediate Certs in the remote webserver configuration it worked.

You can use this site to check the SSL configuration of your server:

https://whatsmychaincert.com/